Assume that trait X is primarily an inherited characteristic. Imagine that trait X is investigated using family studies, twin studies, and adoption studies. Briefly describe each of these three methods and indicate what information each would be expected to yield regarding trait X
What will be an ideal response?
Family studies: there should be more similarity on trait X among relatives who share a greater percentage of genes. For example, there should be more similarity on trait X between identical twins than among siblings, who in turn should exhibit more similarity than cousins.
Twin studies: identical twins should exhibit more similarity on trait X than fraternal twins.
Adoption studies: children adopted in early infancy should more closely resemble their biological parents on trait X than they do their adoptive parents.
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